Also, you might find it more reliable to simply write your flowcharts in an external file and exporting it as an image. This way, you’ll never fail to render it, and it will render equally well on every platform.
An easy-to-use and free software that does this kind of job is graphviz. This could even be automated by an add-on…
Hi, I have thought about your solution (using other software to do it, or mermaid-live-editor), but if there is something wrong with this deck, I have to go to another software to re-modify and export and replace the current deck again. I think it’s a lot of work. Also, may I ask what you mean by the last sentence? Is there such anki addon that can do such a thing? But I didn’t search for it.
No, but since generating an image from a graphviz source is literally I command away, it would be feasible to make an add-on that does what you need for you, without you having to resort to an external program (the add-on would generate the image on its own).